I think it is important to note that an attacker probably does not recognise the pin until the moment it controls him. Such an attacker may then automatically try and resist, simply because he does not exactly know what is happening and perhaps cause damage to himself.
So you would require much less intend than you would in practise where the attacker is fully aware of what is about to happen and thus anticipates.

However that said, in practise I always say we practise for the opponent that is a tad bit better than we are, so we have to work hard to get things right.

In a real fight:
* If you make a bad decision, you die.
* If you don't decide anything, you die.
Aikido teaches you how to decide.www.aikido-makato.nl